Our paper testing the Marginal Value Theorem in captive chimpanzees is out in the American Journal of Primatologists. Study participants adhered to some, but not all, predictions. Chimpanzees showed sensitivity to their rate of energy intake and they foraged longer in higher quality patches, supporting assumptions underlying many hypotheses for primate foraging and social behavior. However, chimpanzees foraged semi-systematically and did not depress patches to the same density, calling into question whether the marginal value theorem is a constructive model of chimpanzee foraging behavior.